Collar sensor apparatus



FIG. 1 is a top, front perspective view showing the collar sensor apparatus from a side position.

FIG. 2 is a bottom, rear perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a left side view thereof; and,

FIG. 8 is a right side view thereof. 

CLAIM I claim the ornamental design for a collar sensor apparatus, as shown and described. 